6 ME. A. W. WATERS OK" BRTOZOA FROM EAPALLO 



ScRUPOCELLARiA EEPTANS, Z., var. Bertholletii, Aud. 

 (PI. 1. figs. 18 & 19.) 



Acamarchis Bertholletii, Audouin in Savigny's Egypte, pi. xi. fig. 3. 



Scrupocellaria Bertholletii, Hincks, Ann. Mag. Nat. Hist. ser. 5, vol. xvii^ 

 p. 258, pi. ix. figs. 1-2. 



This only differs from ^S*. reptans in having a less-developed 

 scutum, for the zooecial characters and the shape is the same in 

 both, and in the type and the variety there are three or four 

 external spines ; the chambers for the avicularia and the radical 

 fibres are exactly similar, as is also the ovicell and the terminal 

 disks of the radical. At the bifurcation, in both, there is a 

 single vibraculum. 



To return to the scutum : this is very variable, and I have 

 specimens where some zooecia have no scutum ; in others it is 

 small bifurcate, then again some are larger bifurcate or cervi- 

 corne, while in S. reptans occasionally the scutum is only 

 bifurcate, other zooecia showing gradations to the fully-developed 

 characteristic scutum. When previously working on the Naples 

 Bryozoa I came upon this, and made a note of it as a variety of 

 S. reptans, with but slightly-developed scutum, but do not seem 

 to have considered it worth describing. Both forms occur at 

 Naples, Capri, Eapallo, and Trieste, and the variety probably came 

 from Egypt. Jullien * says that he has obtained Scrupocellaria 

 reptans with lateral avicularia ; but in the specimens of both the 

 type and the variety in my collection, from various places, this 

 seems to be common ; and Hincks, in his ' British Marine 

 Polyzoa,' had previously mentioned this character, which had 

 been overlooked by older writers. On account of these lateral 

 avicularia Hincks had removed it from Canda, where it had 

 been placed by Busk. S. reptans has two lateral rosette-plates^ 

 and Levinsen says that scruposa and scahra have also two. 

 S. Delilii and ohtecta have the same number, while in several 

 species of Bugula there are four lateral plates. In the Cellu- 

 lariidse this character would seem to be of generic rather than of 

 specific value ; whereas we have seen that in Flustra the specific 



curvata. Waters ; Beania hirtissima, var. robusta, Hincks, and var. cylindrica, 

 H. ; Schisoporella armata, Hincks ; S. magnifica, Hincks ; S. marsufifera, B. ; 

 8. amhita. Waters ; Hornera lichenoides, Pontop. ; Entalophora clavata, Busk ; 

 Buskia socialis, Hincks ; Retepora complanata, Waters ; and Palmicellarior 

 parallelata, Waters. 



* Mission du Cap Horn, p. 69. 



